调用save方法的时候，koa2中间件可以捕获到错误信息
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但是，当我在save方法加上回调函数想自定义错误信息显示的时候,koa2就捕获不到错误信息了
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Clik here to view.请哪位大神教我解决下。
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mongoose +koa2 错误信息自定义输出
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